Threads read, thanks for the link.
It seems a very recent decision, and I beg to disagree. To me, Tyranid Bio-Titans are far from indestructible - you just need to address them differently than, say, Imperium ones. New players are usually trying to kill them with a single shot in the head like Warlords, but it does not work, simply because you need a natural 6 to inflict any critical damage this way. It's much more efficient to shoot the legs, you have half a chance of a critical, and then good chances to to slow down the titan and even to half his CAF. It can then be easily finished off in CC.
In CC, it's also possible to kill a Tyranid Titan. Close combat head, chaos tail, chainfist do wonders - in fact, everything giving some bonus to CAF. Bio-Titans are capped at +14, a warlord can easily beat that, even against a tentacle-equipped bio-titan. The +10 of the Hierodule is even less impressive. Every point of difference in combat result will result in a wound. As usual, destroying a Leg in CC will ensure victory next turn at worst, but you can go for head or thorax damage tables for a quicker kill if the Titan already sustained some wounds.
For those lacking a dedicated CC titan, a ball and chain can also do wonders since it's very possible to half the titan CAF just before combat begins!
Maybe I should have written a Tactica-Vs-Bio-Titans instead of letting people change core rules because they can't find tactics to deal with Bio-Titans... ?
